Update:
I am not sure how to search for the line, though, because you did not give any information on how these lines are structured. Adding that to the one-liner is easy, e.g. let's pretend we want to process lines beginning with 0TONY:

When putting a smiley right before a closing parenthesis, do you:

Use two parentheses: (Like this: :) )
Use one parenthesis: (Like this: :)
Reverse direction of the smiley: (Like this: (: )
Use angle/square brackets instead of parentheses
Use C-style commenting to set the smiley off from the closing parenthesis
Make the smiley a dunce: (:>
I disapprove of emoticons
Other